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Backfire on 2000-XW2002

I just changed oil & oil filter (engine) & air filter on my machine (KOHLER 20HP) each time I shut it off it backfires only one time. This has never happened b4. Is it something I should worry about?? I bought it used last year and this is the 1st time I have had any trouble.

I was once told by Kohler that a backfire on shutdown is normal ,but I think that the motors are set so lean to meet EPA laws that backfires are common .In the old days there were adjustable main & idle mixture screws .Now there are fixed jets,and only an idle speed adjustment .You should remove the heads for cleaning/inspections at least every 2 years. The Lucas oil will be fine in your unit.

Thanks

Thanks for your input.If it is not going to hurt the machine I will not worry about it. I will have it checked out if it gets worse. One small backfire is worth the time I save and the better looking job my Dixie does for me.
Kevin

My 25 HP Kohler will backfire if I shut it down hot, so I just let it run at idle for about one minute, then no backfire. You can 'choke' it off and avoid backfire while hot but I don't believe that's good.

That works for my 25-horsepower Kohler also. I let it idle for a few seconds then set the throttle around 2000-rpm and turn the key off...no backfire!

The first engine was replaced under the factory warranty once and I'm pretty sure the constant backfire each time I shut it off is what caused the heads to lift.

Im pretty sure the backfire is in the muffler,not the engine.I dont think it would have much of an effect on lifting a head.The gasket issue is a known Kohler problem.With my 25,if i dont have time to let it cool for 30 seconds,I find that shutting it off wide open works just as well,as the fuel solenoid shuts off all the fuel,the engine is still winding down,and the last few revolutions are just air,no fuel to cause a backfire.

My 30 hp Kohler will backfire everytime if I shut it off below 3000 rpm once the engine has heated up. I don't like shutting it off at high RPM's but I think it is less harmfull than backfiring all the time.
As for ideling down and waiting till the engine cools down enough.....maybe it's just me but I don't have time to sit for several minutes 20 or so times a day waiting for the engine to cool down enough to shut it off without it backfiring

That is another thing I loved about the EFI kohler I had before this one, six years and never heard the thing backfire even once, no matter how hot it was or where the throttle was at when it turned off.

I’m pretty sure the backfire is in the muffler not the engine. I don’t think it would have much of an effect on lifting a head. The gasket issue is a known Kohler problem. With my 25, if I don’t have time to let it cool for 30 seconds I find that shutting it off wide open works just as well. As the fuel solenoid shuts off all the fuel the engine is still winding down and the last few revolutions are just air, no fuel to cause a backfire.

I tried that method with the old engine, but it would still backfire about 1/2 the time when hot.

The last time I stopped the old engine it backfired hard and wouldn’t run properly again. Maybe the backfire blew the head gasket out?